47 results about "Coulomb damping" patented technology

The invention relates to a control algorithm of an automotive magneto-rheological semi-active suspension system and real-time optimal current, and belongs to the technical field of dampers. The control algorithm is characterized by comprising the steps that damping characteristics of a magneto-rheological damper and the semi-active suspension system are simulated according to the currently measured current; the current running road condition of an automobile is identified according to the running speed and the vibration acceleration of an automobile body; a real-time optimal damping ratio of the semi-active suspension system and an optimal Coulomb damping force of the magneto-rheological damper are determined according to the current running road condition, and speed and suspension parameters; and the real-time optimal control current of the automotive magneto-rheological semi-active suspension under the current running working condition is calculated according to relations among the Coulomb damping force, a structure parameter, a magneto-rheological liquid characteristic parameter, the turn number of an electromagnetic coil and the current. According to the control algorithm, a design level and the performances of the magneto-rheological semi-active suspension system can be raised and improved; design and testing expenses are lowered; and the running smoothness and the safety of the automobile are improved.

The present invention relates to a mixed control system of main beam longitudinal vibration reaction of floated type cable-stayed bridge. It is characterized by that in the bridge tower and bridge main beam connected place of said highway and railway dual-purpose or railway special-purpose floated cable-stayed bridge the MR damper and fluid damper are longitudinally set and combined together. Said invention also provides the control method of said mixed control system, and said control method includes the following steps: utilizing fluid damper to provide fluid damping force of unadjustable parameter, utilizing MR damper to provide coulomb damping force of adjustable parameter, then utilizing longitudinal relative displacement reaction of main beam and bridge tower and longitudinal speed reaction of bridge tower to actively regulate amplitude of coulomb damping force so as to inhibit the main beam longitudinal vibration reation of said cable-stayed bridge which is resulted from train brake and train running.

The invention provides a method for manufacturing a coulomb damped disc brake rotor, including the steps of: (A) providing a mold having the general shape of the coulomb damped disc brake rotor; (B) placing a coulomb damper insert having a generally annular body and at least one tab extending generally radially from the generally annular body, wherein the at least one tab operates to locate the coulomb damper insert within the mold, and wherein the at least one tab at least partially defines an orifice with its major axis generally coincident with the periphery of the coulomb damped disc brake rotor; and (C) causing casting material to enter the mold to substantially encapsulate the coulomb damper insert with the casting material to form a rotor cheek of the coulomb damped disc brake rotor. A coulomb damper insert and coulomb damped disc brake rotor are also disclosed.

The invention provides a metal rubber-disc spring all-metal three-way composite support for piping vibration isolation and impact resistance. The metal rubber-disc spring all-metal three-way composite support comprises metal rubber mats and disc springs, a center net, a locking nut, a pressure cover, a guide holder, a mounting base and a base plate, wherein the metal rubber mats and the disc springs are used for bearing vertical vibration and impact load, the center net is used for bearing horizontal vibration and impact load, the locking nut, the pressure cover, the guide holder, the mounting base and the base plate are used for supporting and fixing an elastic component. By the aid of large bearing capacity and flexible rigidity characteristic, Coulomb damping among the disc springs, and the Coulomb damping between hard rigidity characteristic of the metal rubber mats and the disc springs, the flexible and hard rigidity complex characteristics and larger damping on the vertical bearing direction can be realized. The metal rubber-disc spring all-metal three-way composite support is compact in structure, light in weight, high in high-temperature environment adaptability, good in damping capacity, and lower in vibration isolation frequency, and vertical rigidity has higher static rigidity and lower dynamic rigidity; besides, considerations are also given to shock isolation and a limiting function, so that three-way impact acceleration responses and impact displacement responses can be kept within a reasonable range.

Selected surface regions of coulomb vibration damping strips are bonded face-to-face by ultrasonic welding to a surface region of an article that may experience excessive vibration in use. In one embodiment, prior to welding, the intended facing side of the damping strip is treated to form surface regions that are oxidized, roughened, or coating so that the treated regions do not weld to the article surface. In another embodiment of the invention the ultrasonic welding process is controlled so as to produce regions (sometimes randomly interposed regions) of welded and non-welded regions between the damping strip and adjacent article surface. The unbonded regions of the otherwise welded strip lie in closely-spaced, interfacial, frictional contact with the adjacent article surface to damp vibration in the article. Other processes may be used for welding a damping strip to a surface of an article while leaving un-bonded, friction damping regions between regions of the damping strip and the facing surface of the article.

The present invention is directed to three dimensional weaves composed of wires or yarns that offer the potential for damping not achievable with solid materials, including high temperature damping. Three damping mechanisms have been identified: (1) Internal material damping, (2) Frictional energy dissipation (Coulomb damping), and (3) inertial damping (tuned mass damping). These three damping mechanisms can be optimized by modifying the wire material chemistries (metals, ceramics, polymers, etc.), wire sizes, wire shapes, wire coatings, wire bonding, and wire architecture (by removing certain wires). These have the effect of modifying the lattice and wire stiffnesses, masses, coefficients of friction, and internal material damping. Different materials can be used at different locations in the woven lattice. These design variables can also be modified to tailor mechanical stiffness and strength of the lattice, in addition to damping.

The invention relates to an order-variable permanent magnet rheological damper and belongs to the field of mechanical vibration engineering. The order-variable permanent magnet rheological damper is a non-power-supply damping vibration absorber. The on-off states of a permanent magnet circuit are controlled by changing the magnetic permeability and the axial effective length of an inner cylinder tube, so that the output damping force, changing along with the piston stroke, of the permanent magnet rheological damper is adjusted, order-variable output of coulomb damping force is achieved, preset damping force is obtained, and effective shock absorption is conducted. An inner cylinder tube section of the order-variable permanent magnet rheological damper is formed by fixedly connecting one section of magnetic-permeability material cylinder tube and two sections of non-magnetic-permeability material cylinder tubes, and a permanent magnet structure piston is a multilevel electromagnetic circuit. The permanent magnet rheological damper is free of energy consumption, simple in structural design and high in stability and has other shock absorption properties.

The invention discloses an air spring vibration isolator based on a gas-solid damping and coupling action adjusted by an air cylinder, belonging to the fields of ultra precise measurement and processing. An air cylinder unit which is radially distributed on the vibration isolator is assembled at the bottom of an inner cylinder; a curved damping sheet is fixedly arranged at the outer side part of the air cylinder unit and is in contacted fit with the inner wall of an outer cylinder; and an inclined plane-driving throttling hole area adjusting device is assembled below a throttling hole on the inner wall of the outer cylinder. The total area of the throttling hole is reasonably adjusted by using air throttling damping and the throttling hole area adjusting device; damping with optimal magnitude can be provided when strong vibration and impact load exist in the vertical direction; the reciprocating motion of Coulomb damping and the curved damping sheet relative to the outer cylinder provides damping for the vibration isolator; the real-time adjustment of the Coulomb damping can be realized by adjusting the work pressure of an air cylinder; and the damping with optimal magnitude can be provided when strong vibration, microvibration and impact load exist in the vertical direction.

One or more layers of vibration damping material are placed on one or more selected surface regions of a body portion of a vibratile metal article. The layer of damping material is covered with a thin metal sheet. The selected surface may be recessed in the body portion to receive the damping material. The covering sheet may be formed of the same metal composition as body portion, or of a compatible metal composition. The peripheral edges of the covering sheet are ultrasonically welded to the surface of the article body portion to confine the damping material against the selected surface(s) so that the damping material forms a vibration damping interface(s) with the surface(s) of the article. The damping material may function as a coulomb damping material, or a viscous damping material, or both.

The invention discloses a double-layered fork-shaped radial gas hydrodynamic bearing based on a 3D printing technology. The double-layered fork-shaped radial gas hydrodynamic bearing is composed of two main elements including an integrated variable material bearing body (1) and a top-layer foil sheet (2), wherein the top-layer foil sheet (2) is of a thin-wall non-sealed annular structure, an outward stretching structure is formed at an opening of the top-layer foil sheet (2), and the top-layer foil sheet (2) is fixed with an inner fork-shaped structure of the integrated variable material bearing body (1) by welding or sticking. The integrated variable material bearing body (1) is integrally printed to be molded by applying the 3D printing technology, is a variable material distributed entity, and is mainly composed of four parts including an inner fork-shaped structure (3), an inner annular non-closed structure (4), an outer fork-shaped structure (5) and an outer annular closed structure (6) from inside to outside. A double-layered fork-shaped complicated structure of the bearing can meet relatively large rigidity and can obtain a relatively large bearing capability. The structure has deformation of a plurality of positions and has relatively large damping, and furthermore, relatively large coulomb damping exits between the inner layer fork shape structure and the top-layer foil sheet in a working process, so that the bearing has a relatively strong anti-impact capability. The double-layered fork-shaped radial gas hydrodynamic bearing has a plurality of hollow structures, so that materials are saved, the cost is reduced, the heat dissipation can also be increased, and the temperature rising of the bearing under high-speed running is reduced.

The invention discloses a vibration isolator in a floating slab track system and a method for determining operating parameters of the vibration isolator. The vibration isolator is disposed between a floating slab of the floating slab track system and a track foundation, and comprises parallel steel springs, damping fluid and controllable Coulomb damping elements. The method comprises the steps: in the case of not considering Coulomb damp, establishing a vehicle-floating slab track coupling dynamics time-domain analysis model, taking maximum vertical vibrating displacement of a floating slab and a steel rail as a control index, determining a minimum supporting rigidity Ka of the floating slab without considering the Coulomb damp, then determining a displacement threshold value of floating slab by combining a floating slab vertical vibration displacement time travel curve characteristic under the minimum supporting rigidity working condition without considering the Coulomb damp, determining the magnitude of a Coulomb damping force and an operating time period, and finally calculating the minimum supporting rigidity Kb with the Coulomb damp by utilizing a vehicle-controllable Coulomb damp vibration isolator floating slab track coupling dynamic time-domain analysis model. The vibration isolation efficiency of the traditional steel spring floating slab track can be effectively improved.

The invention discloses a sliding block adjustment-based air spring vibration isolator with gas-solid damping coupling effect, and belongs to the field of super-precision measurement and processing. Circumferentially arranged strip-type damping fins of the vibration isolator are assembled at the bottom of an inner cylinder, sliding block sets uniformly distributed in the radial direction are assembled on the upper end face of the bottom of the inner side of an outer cylinder, a worm gear-worm device is assembled on the lower end face of the bottom of the inner side of the outer cylinder, and a throttling hole area adjusting device of cam transmission is assembled below a throttling hole on the inner wall of the outer cylinder. By using an air throttling damper and the throttling hole area adjusting device, the magnitude of the total area of the throttling hole is reasonably adjusted, and damping of optimal magnitude is provided at strong vibration and impact load in the vertical direction; and damping is provided for the vibration isolator by using the reciprocating motion of Coulomb damping and strip-type damping fins relative to the outer cylinder, the magnitude of the Coulomb damping is changed by adjusting the positions of radial sliding blocks, and the damping of the optimal magnitude is provided at strong vibration, micro vibration and impact load in the vertical direction.

A torque link includes a spring-damper system structurally incorporated into the design and functionality of the torque link. The spring portion may take the form of a structurally rigid beam while the damping portion may take the form of a damping mechanism or assembly. The damping mechanism is configured to damp out deformations in the beam and also configured to bottom out and become a structural tension / compression member when the load through the torque link exceeds a threshold load. The method damping may take a number of forms, such as, but not limited to, solid media damping, fluid damping with or without an orifice, a hydraulic or magnetic circuit, coulomb damping, etc.

Selected surface regions of coulomb vibration damping strips are bonded face-to-face by ultrasonic welding to a surface region of an article that may experience excessive vibration in use. In one embodiment, prior to welding, the intended facing side of the damping strip is treated to form surface regions that are oxidized, roughened, or coating so that the treated regions do not weld to the article surface. In another embodiment of the invention the ultrasonic welding process is controlled so as to produce regions (sometimes randomly interposed regions) of welded and non-welded regions between the damping strip and adjacent article surface. The unbonded regions of the otherwise welded strip lie in closely-spaced, interfacial, frictional contact with the adjacent article surface to damp vibration in the article. Other processes may be used for welding a damping strip to a surface of an article while leaving un-bonded, friction damping regions between regions of the damping strip and the facing surface of the article.

This invention relates to a single electron memory and it spreparation method designed on coulomb damping theory including a monocrystal silicon layer on the surface with SOI as the substrate to be doped and etched to a carbon nm transistor structure containing an electrode as the source, an electrode as the drain and a grid, a single wall carbon nanometer tube is set on the two electrodes to form ohmic contact, the grid is between the two electrodes and at a side of the carbon nm tube, the other tube with more than two tunnel through joints is set on the grid and the source or grain of the transister to form ohmic contact. The said device is easy to be prepared.

A link assembly between an engine and a gearbox includes a male link coupled to the engine or the gearbox, a female link coupled to the engine or the gearbox, wherein the female link receives the male link to allow translation of the male link relative to the female link and to form a radial interface, wherein the radial interface dampens translation of the male link relative to the female link, and a pin releasably coupled to the male link and the female link to selectively retain the male link and the female link.

The invention discloses a parallel radial magneto-rheological valve which comprises a piston outer cylinder and a piston upper end cover arranged at the end of the piston outer cylinder; a plurality of magnetic conductive sheets are evenly arranged on the piston outer cylinder at intervals in the axial direction, and coil separation cylinders are arranged between the magnetic conductive sheets andthe piston outer cylinder; magnet exciting coils are arranged between the coil separation cylinders and the piston outer cylinder; and magnetic conductive sheet holes are formed in the centers of themagnetic conductive sheets in the axial direction, the magnetic conductive sheet holes are through in the axial direction to form first flow guide channels, gaps among the multiple magnetic conductive sheets form second flow guide channels in the radial direction, and third flow guide channels are formed between the magnetic conductive sheets and the coil separation cylinders. According to the parallel radial magneto-rheological valve, the flow guide channels in the radial direction are combined with a multi-channel parallel structure, and meanwhile, controllable coulomb damping force is increased and uncontrollable viscous damping force is reduced, so that the dynamic range of a magneto-rheological damper is greatly enlarged, the controllability of the magneto-rheological damper is greatly improved, and the buffer performance of the magneto-rheological damper in a high-speed impact environment is improved.

The invention relates to an order-variable electromagnetic rheological damper and belongs to the field of mechanical vibration engineering. The on-off states of an effective magnetic circuit of the order-variable electromagnetic rheological damper are controlled by changing the distribution of magnetic circuit responding lengths, order-variable output of coulomb damping force is achieved, preset damping force is obtained, and effective shock absorption is conducted. An adopted piston is provided with a multi-level electromagnetic circuit. An inner cylinder tube section of the magnetic circuit is formed by connecting a magnetic-permeability material cylinder tube and non-magnetic-permeability material cylinder tubes. The order-variable electromagnetic rheological damper is simple in structure, high in application pertinence and high in stability and has other shock absorption properties.

The invention provides a metal rubber-disc spring full metal composite hanging bracket for vibration isolation and impact resistance of a pipeline. The metal rubber-disc spring full metal composite hanging bracket comprises metal rubber net cushions, disc-shaped springs, and a press cover, guide rods, bearing bolts and a shell which are used for supporting and fixing the elastic elements, and also comprises an extending rod, a universal spherical hinge and the like which are connected with the pipeline. The complex flexible and hard rigidity characteristics and large damping are realized by using the large bearing capacity and the flexible rigidity characteristic of the disc springs, the coulomb damping among the disc springs, the hard rigidity characteristic of the metal rubber net cushions, the coulomb damping among the disc springs and the metal rubber net cushions, and the air damping in the gaps between the guide rods and the bearing screw nuts. The metal rubber-disc spring full metal composite hanging bracket for the vibration isolation and impact resistance of the pipeline is compact in structure, light in weight and high in high-temperature environment adaptation, has higher static rigidity, lower dynamic rigidity and excellent damping property, is lower in vibration isolation frequency and is automatically limited, both the impact isolation and limiting functions are considered, and the impact acceleration response and the impact displacement response can be controlled in a reasonable range.

The invention discloses a whirling control method of the rotor of a mini-size turbojet engine, which is characterized in that in the scalar system, the axial pre-tightening force or the waveform gasket compression amount, the waveform gasket rigidity, the rotor speed, the rotor quality and the unbalance information are adopted to accurately compute the thickness, the quantity and mounting mode ofthe coulomb damp gasket for the attenuation whirling through the energy equivalent theory; the damping rubber is combined to adjust the damping of the rotor and mount structurally; thereby, the whirling of the engine rotor is controlled accurately and the stable operation requirement under the higher rotational speed is realized for the mini-size turbojet engine. The whirling control method of therotor of a mini-size turbojet engine has the advantages of accurate coulomb damping computation, accurate whirling attenuation control, simple damp structure, light weight and convenient adjustment,wide application range, being applicable to the different forms of whirling of the mini-size turbojet and the whirling under the different frequencies.

The invention discloses a whirling control method of the rotor of a mini-size turbojet engine, which is characterized in that in the scalar system, the axial pre-tightening force or the waveform gasket compression amount, the waveform gasket rigidity, the rotor speed, the rotor quality and the unbalance information are adopted to accurately compute the thickness, the quantity and mounting mode of the coulomb damp gasket for the attenuation whirling through the energy equivalent theory; the damping rubber is combined to adjust the damping of the rotor and mount structurally; thereby, the whirling of the engine rotor is controlled accurately and the stable operation requirement under the higher rotational speed is realized for the mini-size turbojet engine. The whirling control method of the rotor of a mini-size turbojet engine has the advantages of accurate coulomb damping computation, accurate whirling attenuation control, simple damp structure, light weight and convenient adjustment, wide application range, being applicable to the different forms of whirling of the mini-size turbojet and the whirling under the different frequencies.

The invention relates to a design method of the turn number of an electromagnetic coil of an automotive magneto-rheological semi-active suspension, and belongs to the technical field of dampers. The design method is characterized by comprising the steps that optimal suspension damping ratios based on comfortability and safety are determined respectively according to single-wheel 1 / 4 automobile parameters; the required maximum Coulomb damping force of a semi-active suspension magneto-rheological damper under a condition of the maximum speed is determined according to a suspension lever ratio and a mounting angle of the magneto-rheological damper; and an optimal design is conducted on the turn number N of the electromagnetic coil of the automotive magneto-rheological semi-active suspension according to relations among the Coulomb damping force, a structure parameter and a magneto-rheological liquid characteristic parameter of the damper, and the maximum control current Imax. A reliable design value of the turn number N of the electromagnetic coil can be obtained with the adoption of the design method of the turn number of the electromagnetic coil; a design level, the design level, the quality and the performances of a magneto-rheological semi-active suspension system are raised and improved; a design requirement of ensuring the traveling smoothness of an automobile under the condition of the maximum control current is met; and the design and testing expenses can be lowered.

A torque link includes a spring-damper system structurally incorporated into the design and functionality of the torque link. The spring portion may take the form of a structurally rigid beam while the damping portion may take the form of a damping mechanism or assembly. The damping mechanism is configured to damp out deformations in the beam and also configured to bottom out and become a structural tension / compression member when the load through the torque link exceeds a threshold load. The method damping may take a number of forms, such as, but not limited to, solid media damping, fluid damping with or without an orifice, a hydraulic or magnetic circuit, coulomb damping, etc.

A device for treating hand tremors and methods of using the device. In at least some embodiments, the device includes a glove covering and at least one Coulomb damping suspension assembly. In some embodiments, the Coulomb damping suspension assembly includes a flexible tube and a wire-tube assembly. In some embodiments, the wire-tube assembly includes a first length of a wire and a first tube.

A link assembly between an engine and a gearbox includes a male link coupled to the engine or the gearbox, a female link coupled to the engine or the gearbox, wherein the female link receives the male link to allow translation of the male link relative to the female link and to form a radial interface, wherein the radial interface dampens translation of the male link relative to the female link, and a pin releasably coupled to the male link and the female link to selectively retain the male link and the female link.

The invention relates to a control algorithm of an automotive magneto-rheological semi-active suspension system and real-time optimal current, and belongs to the technical field of dampers. The control algorithm is characterized by comprising the steps that damping characteristics of a magneto-rheological damper and the semi-active suspension system are simulated according to the currently measured current; the current running road condition of an automobile is identified according to the running speed and the vibration acceleration of an automobile body; a real-time optimal damping ratio of the semi-active suspension system and an optimal Coulomb damping force of the magneto-rheological damper are determined according to the current running road condition, and speed and suspension parameters; and the real-time optimal control current of the automotive magneto-rheological semi-active suspension under the current running working condition is calculated according to relations among the Coulomb damping force, a structure parameter, a magneto-rheological liquid characteristic parameter, the turn number of an electromagnetic coil and the current. According to the control algorithm, a design level and the performances of the magneto-rheological semi-active suspension system can be raised and improved; design and testing expenses are lowered; and the running smoothness and the safety of the automobile are improved.

The invention relates to an order-variable permanent magnet rheological damper and belongs to the field of mechanical vibration engineering. The order-variable permanent magnet rheological damper is a non-power-supply damping vibration absorber. The on-off states of a permanent magnet circuit are controlled by changing the magnetic permeability and the axial effective length of an inner cylinder tube, so that the output damping force, changing along with the piston stroke, of the permanent magnet rheological damper is adjusted, order-variable output of coulomb damping force is achieved, preset damping force is obtained, and effective shock absorption is conducted. An inner cylinder tube section of the order-variable permanent magnet rheological damper is formed by fixedly connecting one section of magnetic-permeability material cylinder tube and two sections of non-magnetic-permeability material cylinder tubes, and a permanent magnet structure piston is a multilevel electromagnetic circuit. The permanent magnet rheological damper is free of energy consumption, simple in structural design and high in stability and has other shock absorption properties.